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/DOM

MediaRecorder.mimeType

The MediaRecorder.mimeType read-only property returns the MIME type that is being used as the recording container when it was created. This is the file format of the file that would result from writing all of the recorded data to disk. Keep in mind, of course, that the file format and the codecs associated with the individual tracks are different things entirely; writing tracks that work just fine in a WebM video into an MP4 wrapper may not result in a file that plays everywhere you want it to.

Syntax

var mimeType = MediaRecorder.mimeType

Value

The MIME type being used as the container format for the recorded media, in DOMString form.

Example

...

if (navigator.mediaDevices) {
  console.log('getUserMedia supported.');

  var constraints = { audio: true, video: true };
  var chunks = [];

  navigator.mediaDevices.getUserMedia(constraints)
    .then(function(stream) {
      var options = {
        audioBitsPerSecond : 128000,
        videoBitsPerSecond : 2500000,
        mimeType : 'video/mp4'
      }
      var mediaRecorder = new MediaRecorder(stream,options);
      m = mediaRecorder;

      m.mimeType; // would return 'video/mp4'
      ...
    })
    .catch(function(error) {
      console.log(error.message);
    });

Specifications

Specification	Status	Comment
MediaStream Recording The definition of 'MediaRecorder.mimeType' in that specification.	Working Draft	Initial definition

Browser compatibility

Feature	Chrome	Firefox (Gecko)	Internet Explorer	Opera	Safari (WebKit)
Basic support	47^[2]	25.0 (25.0)	No support	No support	No support

Feature	Android	Android Webview	Firefox Mobile (Gecko)	Firefox OS	IE Phone	Opera Mobile	Safari Mobile	Chrome for Android
Basic support	No support	No support	25.0 (25.0)	1.3^[1]	No support	No support	No support	No support

[1] The intial Firefox OS implementation only supported audio recording.